Ink nozzle for pump-type ink motions



April 9, 1963 F. KLINGLER 3,084,875

INK NOZZLE FOR PUMP-TYPE INK MOTIONS Filed May 24, 1960 INVENTOK FRFTZ KLINGLEK United States Patent 3,084,875 INK NOZZLE FOR PUMP-TYPE INK MOTIONS Fritz Klingler, Augsburg, Germany, assignor to Maschinenfabrik Augsburg-Nurnberg A.G., Augsburg, Germany, a corporation of Germany Filed May 24, 1960, Ser. No. 31,466 Claims priority, application Germany June 6, 1959 2 Claims. (Cl. 239-424) This invention relates to ink motions for printing presses, and particularly to ink motions having ink pumps and ink nozzles for feeding ink in a threadlike fashion through an orifice, using compressed air as a conveying vehicle.

It is known to apply ink, paint and the like liquids of any composition by spraying, whereby the ink and the like is fed under a corresponding high pressure through an orifice. However, this method of applying these liquids has the disadvantage that on account of the high viscosity, approximately 1200 Engler, such ink, for example, builds up on the orifice of the nozzle and only drops off in lumps after said lums have reached a certain weight, whereby the application becomes very uneven and inoperable. When such viscous ink was sprayed or applied in a form of an ink mist, that is, by mixing the ink with air in a jet nozzle, no controlled application was achieved, and the printing press and the press room was more or less affected by the ink mist, so that not only an increased consumption of ink occurred, but also the press room became considerably dirty and the machine operators became unpleasantly annoyed.

These disadvantages are avoided by the presnt invention which comprises a new and improved nozzle for pump-type ink motions, preferably in letterpress and in offset printing machines.

The invention consists in such novel features, arrangements and combinations of parts as may be shown and described in connection with the device herein disclosed by Way of example only and as illustrative of a preferred embodiment.

Objects and advantages of the invention will be set forth in part hereafter and in part will be obvious herefr-om or may be learned by practicing the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.

It is an object of this invention to provide for new and improved nozzle means for applying viscous ink by means of air whereby the orifice for the ink feed is surrounded by a concentric ring-shaped opening and by a plurality of coaxial bores for supplying said air.

Another object of the invention is to provide for contrivances for removing the viscous ink from the nozzle orifice by means of air jets which are directed crosswise through the ring-shaped area surrounding the ink orifice.

A still further object of the invention is to shape the viscous ink stream by means of crossing air jets into an evenly thin thread.

Yet another object of the invention resides in the provision of means for surrounding the ink stream by an air stream from the ring-shaped air orifice and from the coaxial air bores, said air stream forming a rotating air vortex by which the ink thread is carried in a spiralling motion conforming to the rotating vortex mantle.

Various further and more specific objects, purposes, features and advantages will clearly appear from the detailed description given below taken in connection with the accompanying drawing which forms part of this specification and illustrates merely by way of example one embodiment of the device of the invention.

In the following description and in the claims, parts will be identified by specific names for convenience, but

3,h8d,875 Patented Apr. 7 9, 1 963 such names are intended to be as generic in their application to similar parts as the art will permit. Like reference characters denote like parts in the drawing, which illustrates a longitudinal section of an ink-air nozzle shown in an enlarged scale, consisting of a nozzle body 1 which has a central bore 2. The nozzle body 1 is located in the walls 19 and 19 of the air chamber 10. The viscous ink is fed into the central bore 2 through the feed line 20. The central bore extends conically toward the outlet 3 and ends eventually in a cylindrical bore 4. A concentric insert piece or member 5 is held in place in said nozzle body 1 by plugs 16, 16. Insert piece 5 has a central orifice 6 concentric about the cylindrical bore 4- and a plurality of coaxial bores '7 having a small diameter, substantially not exceeding .04" surrounding said central orifice 6. The nozzle body 1 and the insert piece 5 are machined in such way on their contacting areas 18, 18, respectively, that a cone-shaped cavity 8 is formed which is connected by a plurality of bores 9 with the air chamber 10. The central orifice 6 and the surrounding coaxial bores 7 terminate in said cone-shaped cavity area 8, and thus air is fed from the air chamber 10 through said central orifice and through said surrounding coaxial bores. On the other end, opposite the cavity area, the orifice 6, the coaxial bores 7 and the cylindrical bore 4 end in a recess 15 in the discharge face of the insert piece 5. As shown in the drawing, recess 15 has a slanted wall, forming a circular rim on said insert 5. Furthermore, a cleaning needle 11 is provided within the nozzle body 1 by which the nozzle orifice 4 can be cleaned. In the drawing, the numeral 11 indicates the retracted cleaning needle and the numeral 11' the needle in its cleaning position, its point piercing the ink orifice 4.

It can be seen in the drawing that the cone-shaped cavity 8 is arranged in such way that its apex is closely located below the cylindrical outlet bore 4. The air, which enters through the bores 9 coming from the air chamber 10 under a low pressure of substantially 3 /2 inches to 4 /2 inches, more or less (preferably 4 inches) of water column, gets through the cone-shaped cavity 8 by way of the central orifice 6 into the proximity of the nozzle orifice 4, peels off the viscous ink which leaves the cylindrical bore 4, in threadlike form without spraying it and conveys said ink thread to an ink roller (not seen in the drawing) in a fashion diagrammatically shown in the drawing by the spiralling line 13. An air mantle 14 is formed by the air emanating from the coaxial bores 7 and enveloping the rotating vortex, whereby the ink thread is prevented from escaping sideways. In order to avoid spreading of the enveloping air mantle 14, the nozzle orifice 4- and the central air orifice 6 are arranged in said recess 15 of the insert piece or member 5 so that the air mantle 14 assumes more or less a cylindrical shape.

It will thus be understood, that as the air emerges from the cavity 8, it is guided by the slanted walls of the cavity to a point of intersection closely adjacent the ink orifice 4. The swirling motion of the air picks up the ink at the point of intersection and carries it outwardly in a spiralshaped path. Because the air is of low pressure, the ink is not atomized and is maintained in a thread-like form. The air from the bores 7 helps to prevent the spiral shape from spreading excessively.

While the invention has been described and illustrated with respect to a certain particular preferred example which gives satisfactory results, it will be understood by those skilled in the art after understanding the principle of the invention, that various other changes and modifications may be made Without departing from the spirit and scope of the invention and it is intended therefore in the appended claims to cover all such changes and modifications.

I claim:

1. Ink nozzle for pump-type motions in printing presses for applying viscous printing ink in a thread-like spiraling fashion by means of air comprising an air chamber having walls, a nozzle located in said walls of said air chamber and an ink duct and an ink orifice in said nozzle, a central air orifice arranged concentrically surrounding said ink orifice, said nozzle having a first conical shaped area, a second conical shaped area spaced therefrom forming a substantially conical shaped cavity therebetween, said second conical shaped area extending into said central orifice to direct air passing therethrough to a point located on a line passing through the longitudinal axis of said ink orifice, a plurality of bores surrounding said central orifice, the center lines of said bores being substantially parallel with the center lines of said central orifice and said substantially conically-shaped cavity in said nozzle, said cavity having connecting air passages to said central orifice and to said plurality of coaxial bores on one side and to said air chamber on the other side thereof, and a recess having a slanted Wall in the discharge face of said ink nozzle body.

2. Ink nozzle for pump-type ink motions in ink presses according to claim 1 wherein said first conical-shaped area, said central orifice, said plurality of bores, and said recess are formed in a removable insert piece.

References Cited in the file of this patent UNITED STATES PATENTS Holton Jan. 21, Krautzberger Oct, 19, Lusk Oct. 28, Green et a1 c- Dec. 22, Bramsen Mar. 13, Gustafsson Feb. 12, Gustafsson Aug. 4, Gustafsson Nov. 29, Striegel Apr. 1, Anderson Sept. 15, Nieburg NOV. 14, Brodle et a1 May 4, Olson Mar. 1, Carlson Mar. 11,

Liedberg Dec. 16,

FOREIGN PATENTS Great Britain Dec. 23, Australia June 27, Germany Jan. 17, France Jan. 10,

France Jan. 4, 

1. INK NOZZLE FOR PUMP-TYPE MOTIONS IN PRINTING PRESSES FOR APPLYING VISCOUS PRINTING INK IN A THREAD-LIKE SPIRALING FASHION BY MEANS OF AIR COMPRISING AN AIR CHAMBER HAVING WALLS, A NOZZLE LOCATED IN SAID WALLS OF SAID AIR CHAMBER AND AN INK DUCT AND AN INK ORIFICE IN SAID NOZZLE, A CENTRAL AIR ORIFICE ARRANGED CONCENTRICALLY SURROUNDING SAID INK ORIFICE, SAID NOZZLE HAVING A FIRST CONICAL SHAPED AREA, A SECOND CONICAL SHAPED AREA SPACED THEREFROM FORMING A SUBSTANTIALLY CONICAL SHAPED CAVITY THEREBETWEEN, SAID SECOND CONICAL SHAPED AREA EXTENDING INTO SAID CENTRAL ORIFICE TO DIRECT AIR PASSING THERETHROUGH TO A POINT LOCATED ON A LINE PASSING THROUGH THE LONGITUDINAL AXIS OF SAID INK ORIFICE, A PLURALITY OF BORES SURROUNDING 